Deprotection of 1,3-oxathiolanes to ketones promoted by base
摘要:
A variety of 1,3-oxathiolanes can be easily converted to the corresponding ketones in good yields with LTMP in THF. This deprotection methodology shows satisfactory chemoselectivity when other protecting groups, such as dimethylketal, 1,3-dioxolane, 1,3-dithiane, and other acid-sensitive groups, are present within the same substrates. (C) 2013 Elsevier Ltd. All rights reserved.
Divergent synthesis of conidiogenones B–F and 12β-hydroxyconidiogenone C
作者:Jiheon Kim、Sanghyeon Lee、Sunkyu Han、Hee-Yoon Lee
DOI:10.1016/j.chempr.2023.01.018
日期:2023.2
new syntheticstrategies. While the D-ring with distinct oxidative decorations serves as a fingerprint region of these natural products, most synthetic approaches focused on the construction of the highly congested tetracyclic structure, and a divergent synthetic approach amenable to D-ring modifications remains unknown. Herein, we describe a syntheticstrategy that enabled a divergent synthesis of
自 2002 年首次发现 conidiogenone 以来,已分离出 20 多种高度拥挤的 6/5/5/5-融合 cyclopianes,并成为开发新合成策略的舞台。虽然具有明显氧化装饰的 D 环作为这些天然产物的指纹区域,但大多数合成方法都集中在高度拥挤的四环结构的构建上,并且适合 D 环修饰的不同合成方法仍然未知。在此,我们描述了一种合成策略,该策略能够发散合成六种分生孢子素,包括三个首次全合成。三亚甲基甲烷 (TMM) 二基介导的环加成方便地形成了四环分生孢子酮核心。
A new molecular iodine-catalyzed thioketalization of carbonyl compounds: selectivity and scope
作者:Susanta Samajdar、Manas K Basu、Frederick F Becker、Bimal K Banik
DOI:10.1016/s0040-4039(01)00752-3
日期:2001.7
A new molecular iodine-catalyzed thioketalization of carbonyl compounds has been developed. (C) 2001 Elsevier Science Ltd. All rights reserved.